[objc] Add call to mono_domain_set_config to avoid ConfigurationErrorsException (#127)
[objc] Add call to mono_domain_set_config to avoid ConfigurationErrorsException (#127)

A ConfigurationErrorsException was raised when trying to use WebClient/HttpClient
right now we are setting mono_domain_set_config's base_dir to current working
directory and giving it a non existent app config. We might want to adjust
this settings in the future when needed.

Ref https://github.com/mono/mono/commit/57f5187ad29a7913f083a659ea77d90eb8bad4d4
mono/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,mono/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,mono/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,mono/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,mono/Embeddinator-4000,mono/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,mono/Embeddinator-4000